Process of extracting milk-sugar from whey.



j UNITED STATES PATENT OFFICE.

JOHN ANDERS REINHOLD NILSSON AND SVEN ADOLF HELLQVIST, OF IBJ'GRKETOBP,

' SWEDEN.

PROCESS OF EXTRACTING MILK-SUGAR FROM WHEY.

No Drawing.

To all whom it may concern Be it known that we, JOHN ANDERS REIN- HOLD NILSsoN and SVEN ADoLr HELL vIs'r, subjects of the Kingof Sweden, and residents of Bjorketorp, Sweden, have invented a new and useful Improved Process of Extracting Milk- Sugar from Whey, of'which tion commences whereupon the refined sugar lsseparated by means of a centrifugal apparatus. In sald process a very essential part of the. milk-sugar remains in the motherliquor in separating the rough sugar and another part of the milk-sugar is lost with the refined sugar solution which cannot be fully utilized. In treating whey with a-percent age of sugar of 4.64.7 it has heretofore been possible to obtain a result of at most 2.5

' percentage aspure refined sugar while the remainder has been lost.

The chief object of the present invention is to reduce the losses of sugar due to an incomplete, extraction of sugar from the concentrated whey and thereby to make the process more economical than heretofore.

The invention consists in 'first separating from the whey the greater part of the albuminous substances by preclpitation and filtration in well known manner, concentrating the whey to a specific gravity of 1.11 or the concentration generally used in refining rough sugar, refining the solution by pre-' cipitating the remainder of the albuminous and other precipitable substances, filtering the solution and concentrating the same until crystallization commences, and finally separating the refined sugar in well known way by means of a centrifugal apparatus.

Specification of Letters Pal/ant.

Application filed April 28, 1909. Serial No. 492,697.

refining sugar,

Patented Oct. 26, 1909.

Example: From a quantity of whey of 3280 liters and of a specific gravity of 1.028

and a percentage of sugar of 4.6 the greater part of the albumen was precipitated, whereupon the whey was filtered and concentrated.

to a specific .gravityof 1.11 and the solution obtained was refined, filtered and concentrated until crystallization commenced, whereupon it was left to cool and finally subjectedto a separation process in a centrifugal apparatus. The following products were obtained: 113 kg. refined sugar with a percentage of water of-14 17 0 liters refined sugar solution containing 15.1 gr.

97.18 kg. sugar sugar pro 10Q cm 25.67 kg. sugar Total 122.85 kg. sugar However of the sugar contained in the refined sugar'solution only. about 50% can be gained, so that the real result in the example given above was 97.18-{- 12.835=1"10.015 kg. This result corresponds to 3 .26% and the loss to 1.34% and is thus very good. The usual average result as stated by Herzfeld is 2.5% in treating whey with a percentage of sugar of 4.7. In, concentrating whey with said percentage of sugar according to the present invention the process can be calculated to leave a result of at least 3.3% or an increase of 0.83% compared with the result obtained in the old methods.

The amount of labor necessary in carrying out this process is about the same as that necessary. in the processes heretofore used. The labor saved in carrying out the centrifugal partof theprocess involved in this invention is about equivalent to the increased labor necessitated in the filtration,

but, inasmuch as the vaporization of the water otherwise used for dissolving the rough sugar is obviated, about 15% of fuel is Ispared. v

avingnow described our invention what we claim 'as new and desire to secure by Letters Patent is: e

The process of extracting milk-sugar from whey, which consists after separating the greater part of the albuminous substances by precipitation and filtratlon, 1n concentrating the whey to a specific gravity of about as our invention, we;have signed'our names 1%1, again precipitating, and filtderingf thle in presence of two subscribing witnesses.

so ution or removin the remain er 0 a buminous substances and other impurities, JOHN S concentrating the solution until crystalliza- SVEN m I Q s tion commences, and finally extracting the Witnesses: refined sugar, in the order named. I TASTEN NOTHIN, In testimony that we claim the foregoing C. NoRDENDAfiL. 

